Standard form (as in Ax + By = C) after you have distributed the negative "-" to x+7, you can keep one side for variables and another for constants (C). So you would subtract x from both sides then finally, add 2 to both sides.
1. 4800-2000=2800
This is the distance that the balloon needs to fall to reach an altitude of 2000 feet.
2. 2800/40=70
Distance/rate=time
The answer is 70 minutes.
I think you just have to rewrite it to
-1.46×10^-7
First you gotta find the slope
Then you can put it into point slope form using either of the points
It's Dublin - San Juan
Departure Friday at 1:30 Pm (Dublin Time) ==> Time San Juan 9:30 (-4 Hours)
Travel time 16 Hrs ( Dub Sat at 6:30PM) & arriving San JUan on Sat at 9:30 +16;30 26 that means 2 AM (26-24)